https://www.cnet.com/news/black-friday-2018-iphone-deals-150-off-iphone-xr-and-xs-400-iphone-x-gift-card-max-1/

T-Mobile is offering you a free iPhone XR, iPhone 8 or iPhone 8 Plus, or up to $750 off the iPhone X, XS or XS Max. That's when you trade in your old phone and add an additional line of service to what you already pay. For example, if you already have one phone line, this deal works when you add a second line -- but not if you're trying to buy a new phone on your existing line of service. 

The savings come in the form of bill credits over a 24-month period. T-Mobile's offer begins Nov. 16. Read more about T-Mobile's full Black Friday deal here.